Java I/O StreamsLesson 56Free preview

Java FileOutputStream

This lesson is part of Java · All levels

Summary

FileOutputStream writes bytes to a file, with the option of either adding to the old content or adding to the end via the append parameter. Suitable for storing binary data such as images, audio, or the results of object serialization. The data that is still stored in the new buffer is actually written after flush() or close() is called.

Key points

Constructors add content, and the new
Write(int b) wrote one byte, write(byte[]) and write(byte[], off, len) wrote many
If the file doesn't exist, the stream will automate it.
Data can be lost if you forget because the buffer has not been sent to the disk
It can be packed into BufferedOutputStream to write a lot of small data quickly

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